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[0/2] fsl_lpuart: Add IDLE interrupt support for rx_dma on imx7ulp/imx8ulp/imx8qxp

Message ID 20230710013857.7396-1-sherry.sun@nxp.com
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Series fsl_lpuart: Add IDLE interrupt support for rx_dma on imx7ulp/imx8ulp/imx8qxp | expand

Message

Sherry Sun July 10, 2023, 1:38 a.m. UTC 
Now in the lpuart driver, we use receive dma timer to simulate the hardware EOP
event, but the timer latency is big which cause the Bluetooth Firmware download
timeout on Android platform(it has a limited FW download time window).

So here we use IDLE interrupt support for receive dma on
imx7ulp/imx8ulp/imx8qxp platforms to replace the receive dma timer, which can
reduce the BT FW download time obviously and the performance close to hardware
EOP.

Patch#1 move the lpuart32_int() below lpuart_copy_rx_to_tty() to avoid the
function declaration in Patch#2.

Sherry Sun (2):
  tty: serial: fsl_lpuart: move the lpuart32_int() below
  tty: serial: fsl_lpuart: add IDLE interrupt support for rx_dma on
    imx7ulp/imx8ulp/imx8qxp

 drivers/tty/serial/fsl_lpuart.c | 83 ++++++++++++++++++++++++---------
 1 file changed, 61 insertions(+), 22 deletions(-)